Opis • Zastosowania / Funkcja

This member of the 5f transition
elements (actinide series) was discovered in March 1961 by A. Ghiorso, T. Sikkeland, A. E. Larsh, and R. M. Latimer.A 3 microgram californium target,
consisting of a mixture of isotopes of mass number 249, 250, 251, and 252, was bombarded with either 10B or 11B. The electrically charged transmutation
nuclei recoiled with an atmosphere of helium and were collected on a thin copper conveyor tape which was then moved to place collected atoms in
front of a series of solid-state detectors. The isotope of element 103 produced in this way decayed by emitting an 8.6-MeV alpha particle with a halflife
of 8 s. In 1967, Flerov and associates of the Dubna Laboratory reported their inability to detect an alpha emitter with a half-life of 8 s which was
assigned by the Berkeley group to Element 103-257. This assignment has been changed to lawrencium-258 or lawrencium-259. In 1965, the Dubna workers found a longer-lived
lawrencium isotope, lawrencium-256, with a half-life of 35 s. In 1968, Ghiorso and associates at Berkeley were able to use a few atoms of this isotope to study
the oxidation behavior of lawrencium. Using solvent extraction techniques and working very rapidly, they extracted lawrencium ions from a buffered
aqueous solution into an organic solvent, completing each extraction in about 30 s. It was found that lawrencium behaves differently from dipositive
nobelium and more like the tripositive elements earlier in the actinide series. Ten isotopes of lawrencium are now recognized. 1

Witamy!

Chemistry-Reference.com provides you with capsules on many topics in chemistry. Additionally, there are reference tables and profiles of every element and thousands of compounds. Use the interactive menu bar located above to get started. Many online periodic tables only provide basic information for a particular element. Here, a full profile of the element's physical properties, chemical behavior, isotopes, and electron structure are provided. For further reading and reference, list of sources can be found at the conclusion of each page.